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Intensified Arctic warming under greenhouse warming by vegetation–atmosphere–sea ice interaction

Journal article
Authors Jee-Hoon Jeong
Jong-Seong Kug
Hans W. Linderholm
Deliang Chen
Baek-Min Kim
Sang-Yoon Jun
Published in Environmental Research Letters
Volume 9
Pages 094007
ISSN 1748-9326
Publication year 2014
Published at Department of Earth Sciences
Pages 094007
Language en
Links dx.doi.org/10.1088/1748-9326/9/9/09...
Keywords vegetation feedback, Arctic warming, global climate model, sea ice, climate fee
Subject categories Climate Research

Abstract

Observations and modeling studies indicate that enhanced vegetation activities over high latitudes under an elevated CO2 concentration accelerate surface warming by reducing the surface albedo. In this study, we suggest that vegetation-atmosphere-sea ice interactions over high latitudes can induce an additional amplification of Arctic warming. Our hypothesis is tested by a series of coupled vegetation-climate model simulations under 2xCO2 environments. The increased vegetation activities over high latitudes under a 2xCO2 condition induce additional surface warming and turbulent heat fluxes to the atmosphere, which are transported to the Arctic through the atmosphere. This causes additional sea-ice melting and upper-ocean warming during the warm season. As a consequence, the Arctic and high-latitude warming is greatly amplified in the following winter and spring, which further promotes vegetation activities the following year. We conclude that the vegetation-atmosphere-sea ice interaction gives rise to additional positive feedback of the Arctic amplification.

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